Question

a和b是有理数化简

规定两种新运算：a*b=a+b,a#b=a-b,其中a、b为有理数.化简a²b*3ab+5a²bb#4ab,并求出当a=5,b=3
化简a²b*3ab+5a²b#4ab

Answer 1

a²b*3ab+5a²bb#4ab
=a²b+3ab+5a²b-4ab
=6a²b-ab
当a=5 b=3时
原式=6*5²*3-5*3
=450-15
=435